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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a465f15eaf6da047e9cbadb07b914a55b95b6d1136d9f8467383f3470d348c7a' 
  AND token = 'ZMvS8R/f3RJJ4eJAzx/cozFnUaimM5POryLkyCkoB2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}